Improvement in hollow augers



UNITED STATES PATENT OEEIGE..

.IAMEs LEFEBER, or CAMBRIDGE CITY, INDIANA.

IMPROVEMENT IN HOLLOW AUGERS.

Specification forming part ofLettcrs Patent No. 58,436, dated October 2, 1866; antcdated August 23, 1866.

To all whom z'tmay concern:

Be it known that I, JAMEs LErEBER,ofCa1n bridge City, Wayne county, and State of Indiana, have invented a new and useful lm* provement in Hollow Augers, and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming partof this specification, in whichu Figure 1 is an axial section, in the line y of Fig. 3, of a hollow auger made according to my invention. Fig. 2 is a bottom or face view. Fig. 3 is a cross-section on the line x' of Fig. l.

Similar letters of reference indicate like parts.

In this construction of a hollow auger simplicity, strength, durability, and cheapness have been sought after. The extreme diame ter of the auger is found on its bottom or face, .whence-it rapidly decreases, and its body is `carried up of a small diameter. Vings are formed on the opposite sides of the body to receive the sh anks ofthe cutters, which shanks are adjustably secured to them. The cutters are at right angles to their shanks and project through openings in the bottom or face of the auger. Y

A designates the squarenotched tang, by which the auger may be held. in a brace. B

than the bottom F of the auger, and has the radial win gs Gextending therefrom lat points opposite to each other, to which win gs the shanks D ofthe cutters or bits E are fixed, adjustably, by means ot screws, which hold the Shanks firmly against said wings, passing through oblong slots in said shanks, so that the bits can be raised or lowered to cut more or less chip, as desired by the operator.

In the axial section, Fig. 1, the shank D of one of the cutters is seen on the left-hand side, and one of the wings G is seen on the righthand side.

The bits E are at right angles with their shanks and occupy openings in the bottoni F of the auger, which are enough wider than the bits to allow the chips made by their cntting-edgcs to pass upward around body B. The shanks D, moreover, are wider at bottom, Where they join the bits, than they are at top, so as to give increased strength at the place where it is most required, and the body of the auger is cut down alongside ot' the wings G to make room and allowance for this shape in the shanks.

The letter C designates the hollow space in the auger to receive the tenon which is formed by it.

What I claim as new, and desire to secure by Letters Patent, ist lA hollow auger, substantially as above deL scribed, with radial wings on the exterior of its body, and with bits or cutters fastened ad- 'justably to such wings, as above shown. is a cylindrical stock, wh1ch is of less diameter JAMES LEFEBER.

Witnesses:

ELY S. SPRIGes, SAMUEL WIDovER. 

